CENOZOIC SOUTH AMERICAN LAND MAMMAL AGES: CORRELATION TO GLOBAL GEOCHRONOLOGIES

1995 ◽  
pp. 317-333 ◽  
Author(s):  
JOHN J. FLYNN ◽  
CARL C. SWISHER
Keyword(s):  
South American ◽  
Land Mammal

Chronostratigraphy and “Land-Mammal Ages” in the Cenozoic of southern South America: principles, practices, and the “Uquian” problem

1995 ◽  
Vol 69 (1) ◽  
pp. 135-159 ◽  
Author(s):  
Alberto L. Cione ◽  
Eduardo P. Tonni
Keyword(s):  
South America ◽  
Buenos Aires ◽  
New South ◽  
Lower Boundary ◽  
Buenos Aires Province ◽  
South American ◽  
Southern South America ◽  
Matuyama Chron ◽  
Study Case ◽  
Land Mammal

The concept of “land-mammal age” as developed in South America is examined. The “Uquian Land-mammal age” is used as a study case. “Land-mammal age” parataxonomy is here considered methodologically but not conceptually different from chronostratigraphic taxonomy. “Land-mammal ages” in South America are based on stages. However, we consider that accurate biostratigraphic studies must be done in South America for establishing the biostratigraphy and precise boundary stratotypes of most stages-ages. The Uquia outcrops are here considered inadequate as a stratotype. A new South American continental stage-age is proposed. This stage is based on a biostratigraphic scheme. The stratotypes of the stage and biozones are located in the fossiliferous southeastern Buenos Aires Province marine cliffs. The lower boundary stratotype is proposed. The stage-age is probably correlated with the Gauss Chron and the lower Matuyama Chron. Additionally, some major units of Ameghino are validated and a different timing for the arrival of North American mammals to southern South America is presented.

Revised timing of the South American early Paleogene land mammal ages

2014 ◽  
Vol 54 ◽  
pp. 109-119 ◽  
Author(s):  
Michael O. Woodburne ◽  
Francisco J. Goin ◽  
Maria Sol Raigemborn ◽  
Matt Heizler ◽  
Javier N. Gelfo ◽  
...  
Keyword(s):  
South American ◽  
The South ◽  
Land Mammal ◽  
Early Paleogene

scholarly journals Patagonian Eocene Archaeopithecidae Ameghino, 1897 (Notoungulata): systematic revision, phylogeny and biostratigraphy

2017 ◽  
Vol 91 (6) ◽  
pp. 1272-1295 ◽  
Author(s):  
Bárbara Vera
Keyword(s):  
Middle Eocene ◽  
Mass Range ◽  
Late Eocene ◽  
The Body ◽  
South American ◽  
Type Specimens ◽  
Systematic Revision ◽  
Size And Morphology ◽  
Land Mammal ◽  
First Time

AbstractThe Archaeopithecidae is a very poorly known group of native ungulates from the Eocene of Patagonia (Argentina), whose alpha taxonomy has remained obscure since Ameghino’s times. It is traditionally considered as a family representative of the Casamayoran (middle Eocene) South American Land Mammal Age, and is thought to be morphologically close to the notopithecids. After studying >200 specimens from several institutions, including all the type specimens, a taxonomic overestimation is established. Out of the six species considered originally as archaeopithecids, Archaeopithecus rogeri Ameghino, 1897 is here recognized as the only valid name and species; subsequent synonymies are proposed and previous taxonomic hypotheses discarded. This exhaustive revision has permitted improving the knowledge of A. rogeri and, for the first time, it has revealed many craniodental characters, which allow amending its diagnosis and differentiating this taxon from other Eocene notoungulates. Archaeopithecus rogeri is a small-sized taxon characterized by its complete and rooted dentition, which is relatively higher than that of other contemporaneous short-crowned notoungulates and shows ontogenetic variation in size and morphology. The body mass range of A. rogeri (1.4–2.5 kg) is comparable to those of notopithecids and some small hegetotheriids. The phylogenetic analysis shows A. rogeri is not directly related to any family within Notoungulata, appearing into a polytomy, as a basal taxon of typotherians. The biochronological range of A. rogeri is adjusted to Vacan (middle Eocene) through Barrancan subages (late middle Eocene); older (Riochican, late early Eocene) and younger (Mustersan, late Eocene) records remain to be confirmed.

scholarly journals Macraucheniidae and Proterotheriidae (Mammalia, Litopterna) from Quebrada Fiera (Late Oligocene), Mendoza Province, Argentina

2019 ◽  
Vol 46 (2) ◽  
pp. 368
Author(s):  
Gabriela Ines Schmidt ◽  
Esperanza Cerdeño ◽  
Santiago Hernández Del Pino
Keyword(s):  
Comparative Study ◽  
Geographical Range ◽  
Lower Latitude ◽  
South American ◽  
Late Oligocene ◽  
Temporal Interval ◽  
New Material ◽  
Land Mammal ◽  
Upper Molar

In this contribution we present new specimens of Litopterna recovered during the last decade in Quebrada Fiera (Mendoza Province, Argentina), whose fossiliferous sediments, currently recognized as the base of Agua de la Piedra Formation, are assignable to Late Oligocene (Deseadan South American Land Mammal Age). Two remains mentioned in the first publication on this locality were neither detailed nor described, and they have not been located in the corresponding repository. The new material consists of postcranial fragmentary remains (astragali, calcaneum, and metapodials) of Macraucheniidae (Cramaucheniinae) and an incomplete upper molar (M3) of Proterotheriidae (Proterotheriinae). These few remains of litopterns contrast with the abundance of notoungulates at Quebrada Fiera. A comparative study was carried out with material from Patagonia (Argentina) and taxa recorded in Bolivia and Peru for the same temporal interval. The specimens of Cramaucheniinae are assigned to Coniopternium andinum and the molar of Proterotheriinae to cf. Lambdaconus suinus. This contribution allows us to extend the geographical range of Coniopternium, filling the gap between the Patagonian and lower latitude localities (Bolivia and Peru) in which this genus was found. The record of L. suinus in Quebrada Fiera expands the geographical range of this species outside from Patagonia.

Mammalian faunal dynamics of the great American interchange

Paleobiology ◽  
1976 ◽  
Vol 2 (3) ◽  
pp. 220-234 ◽  
Author(s):  
S. David Webb
Keyword(s):  
North America ◽  
South America ◽  
Late Pleistocene ◽  
Turnover Rate ◽  
Marked Decrease ◽  
Important Change ◽  
South American ◽  
The Family ◽  
Family Level ◽  
Land Mammal

The American interchange of land mammals reached its acme during the late Blancan and early Irvingtonian in North America and during the Chapadmalalan and Uquian in South America. It lasted about two million years and included taxa adapted to diverse habitats. It was preceded in the early Hemphillian in North America and the Huayquerian in South America by the interchange of a few heralding genera. The MacArthur-Wilson faunal equilibrium hypothesis correctly predicts a marked increase in originations, number of genera, and turnover rate for the South American fauna during the peak of the interchange. Subsequent further increases were not so predicted but closely resemble patterns also observed in late Pleistocene land mammals of Europe and North America. The continued increase in South American land mammal genera after the interchange had largely ceased resulted principally from autochthonous evolution of northern immigrant stocks. A marked decrease in South American ungulate genera (from thirteen to three) coincided with the appearance of fourteen northern ungulate genera and therefore appears to be a replacement phenomenon. The area/diversity relationship predicts no important change in generic diversity if a maximum of only nine percent of North America is occupied by the interamerican mingled fauna. At the family level, however, diversity is seriously overestimated due to the nomenclatural artifact of increased relative diversity by filtering.

Revised age of the Salla beds, Bolivia, and its bearing on the age of the Deseadan South American Land Mammal “Age”

1998 ◽  
Vol 18 (1) ◽  
pp. 189-199 ◽  
Author(s):  
Richard F. Kay ◽  
Bruce J. Macfadden ◽  
Richard H. Madden ◽  
Hamish Sandeman ◽  
Federico Anaya
Keyword(s):  
South American ◽  
Land Mammal
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